I would pay a premium for a working rotary cell phone. The novelty of such would be grand fun indeed. Of course a few digital buttons for voice messages and phone numbers would be needed on the bottom, but an rotary dial on a cell phone would be a hoot.
What many people need to remember is that despite all of the technological advances in cell phone privacy, our laws have not kept pace. If you want to be assured of a private phone call when you are dealing with your credit card companies, bank or even your mistress or boy toy, a home phone connected to a land line is the only method of communication short of a written letter that is protected fully by law from prying ears, accidentally or not.
If you give your private information over a cell phone the information is NOT protected the same as if it were a private phone line conversation. If you think you may ever need to question a bank statement or a credit card charge via a phone converstaion, a wise person would choose to use a phone connected to a secure land line.